Gemma 4 OpenCoder 40B-A8B
Gemma 4 OpenCoder is a continued Gemma 4 reasoning model focused on OpenCode-style coding workflows, tool use, and production software tasks.
It is intended for agentic coding environments where the model can reason, inspect context, call tools, edit files, and continue through multi-step implementation tasks.
The checkpoint adds roughly 14B parameters to the Gemma 4 26B-A4B base and was post-trained on approximately 30k OpenCode-oriented coding samples.
Model profile
| Field | Value |
|---|---|
| Total parameters | ~40.1B |
| Active parameters | ~8.0B |
| Added parameters | ~14.3B |
| Context length | up to 256K tokens |
| Format | NVFP4 |
| Base model | google/gemma-4-26B-A4B-it |
| Primary focus | coding-agent workflows, reasoning, and tool calling |
Recommended use
Run this model in OpenCode or another compatible agent harness with reasoning and tool calling enabled.
Use a recent vLLM runtime with Gemma 4 NVFP4 support:
vllm serve <repo-id> \
--max-model-len 262144
For best results, use the native Gemma 4 chat template and keep reasoning/tool-calling behavior enabled in the client stack.
Example OpenCode session
In one continuous OpenCode chat, the model one-shot generated:
- a stylish SVG Flappy Bird-style game
- a Breakout-style game
- a skiing game
- a monster truck jumping over cars
Screenshots
Notes
This checkpoint is intended for coding-agent workflows. It is not positioned as a general chat-only model. Use a harness that supports long context, reasoning, and structured tool use.